25 Theories to Get You Started Supply and Demand

Keynesian economics

Developed by the economist John Maynard Keynes, Keynesian economics describes Keynes' economic theories and beliefs, which contained the conviction that government involvement in the economy through spending and taxes could help increase demand and move an economy out of a depression.

Law of demand

The law of demand examines how customers’ buying habits change when prices increase. Specifically, the theory posits that all other things being equal, when prices of a good increase, the demand for that good falls.

Law of supply

The law of supply states that all other things being equal, an increase in price levels results in an increase in the quantity of those goods that are supplied.

Macroeconomics

Macroeconomics studies how the economy behaves in the aggregate, i.e. as a whole. Concepts examined in macroeconomics include:

Inflation;

The level of prices in the economy;

Growth rate.